UnitedHealthcare does not have one fax number. For urgent clinical appeals on commercial (employer) plans, its 2026 provider guide lists 1-866-654-6323. Individual Exchange appeals go to 1-888-404-0949 (standard) or 1-888-808-9123 (expedited), and Medicare Part D appeals go to 1-866-308-6294. Most medical prior authorizations must be submitted electronically, but Optum Rx pharmacy requests can be faxed to 800-527-0531 (non-specialty) or 800-853-3844 (specialty). If your denial letter shows a different number, use that one.

This guide lists every UnitedHealthcare fax number we could check against an official UHC source, says which plan each one is for, and covers the mistakes that get a faxed appeal or request stuck.

  • Fax lines are split by plan type: commercial, Individual Exchange, Oxford, UMR, Medicare Advantage, and Part D
  • Verified numbers, each linked to the UnitedHealthcare page or PDF it came from
  • Medical prior authorization is mostly electronic. Fax is mainly for appeals and pharmacy.

Table of Contents

Why UnitedHealthcare has so many fax numbers

UnitedHealthcare is one brand covering many businesses. Employer plans, Affordable Care Act exchange plans, Oxford plans in the Northeast, UMR-administered self-funded plans, Medicare Advantage, and Part D drug plans each run their own appeals operation. On top of that, each splits urgent from standard requests and medical from pharmacy.

So you need to know the plan before you can pick a number. The plan type is printed on the member ID card. If the card says UMR or Oxford, or shows a Medicare logo, use the row for that plan, not the general commercial one.

Verified UnitedHealthcare fax numbers

These numbers come from UnitedHealthcare's own domains: the 2026 Care Provider Administrative Guide on uhcprovider.com, the uhcprovider.com contact page, and uhc.com Medicare pages. Each one applies only to the plan type and request listed.

Verified November 2026:

Plan type Request Fax number Source
Commercial (employer) plans Urgent clinical appeal 1-866-654-6323 UHC 2026 Administrative Guide
Commercial (employer) plans Urgent medical 1-801-994-1083 UHC 2026 Administrative Guide
Commercial (employer) plans Urgent pharmacy 1-801-994-1058 UHC 2026 Administrative Guide
Individual Exchange plans Appeals and reconsiderations, standard 1-888-404-0949 UHC 2026 Administrative Guide
Individual Exchange plans Appeals and reconsiderations, expedited 1-888-808-9123 UHC 2026 Administrative Guide
Individual Exchange plans Pharmacy appeals (Optum Rx), standard and expedited 1-877-239-4565 UHC 2026 Administrative Guide
Oxford commercial plans Member appeals and grievances 203-601-6893 UHC 2026 Administrative Guide
UMR and UnitedHealthcare Shared Services Pre-service appeals 1-888-615-6584 UHC 2026 Administrative Guide
Medicare Advantage Member appeals and grievances forwarded by network providers 1-888-517-7113 UHC 2026 Administrative Guide
Medicare Part D Appeals (redeterminations) 1-866-308-6294 uhc.com Part D appeals
Medicare Part D Coverage determinations (Optum Rx Prior Authorization Department) 1-844-403-1028 uhc.com Part D appeals
Commercial and Medicare Advantage Optum Rx pharmacy requests, non-specialty medications 800-527-0531 uhcprovider.com contact page
Commercial and Medicare Advantage Optum Rx pharmacy requests, specialty medications 800-853-3844 uhcprovider.com contact page

Notes on these numbers:

  • Standard commercial appeals have no general fax in the guide. Written appeals for commercial plans go by mail to UnitedHealthcare, P.O. Box 30573, Salt Lake City, UT 84130-0573, or through the member's myuhc.com account. Use a fax only if your denial letter gives you one.
  • Medicare Advantage members are told on uhc.com to fax appeals and coverage decision requests to the number in their own Evidence of Coverage, because it differs by plan. The 1-888-517-7113 line comes from the provider guide. Treat your EOC as the primary source.
  • Medicaid (Community Plan) numbers differ by state and are not listed here.

The number on your letter wins

Every number above is a general line. If UnitedHealthcare sent you a denial letter, an EOB, or a request for information, fax your response to the number printed on it. That letter was produced by the unit holding your case, and its fax line goes back to the same queue.

The same rule applies to the member ID card. The card shows the plan type and the customer service number. If you can't tell which row in the table applies, call that number and ask for the fax line for your exact request: appeal, grievance, claim, or pharmacy.

Prior authorization: fax or portal?

For medical services, UnitedHealthcare's 2026 administrative guide is clear that prior authorization requests must be submitted electronically. That means the UnitedHealthcare Provider Portal, EDI 278 transactions, or the API. Phone and fax requests are not accepted unless law requires them. The guide adds that some plans keep a fax line because their state mandates one. Those plans keep using their existing number, which will be in plan-specific materials.

Pharmacy is the exception. Optum Rx, UnitedHealthcare's pharmacy benefit manager, accepts faxed medication requests at the two numbers in the table, split by specialty and non-specialty drugs. For Medicare Part D, coverage determination requests go to the Optum Rx Prior Authorization Department fax at 1-844-403-1028.

For how to build the request itself, see our prior authorization guide.

How to fax UnitedHealthcare, step by step

  1. Identify the plan type from the member ID card: commercial, Individual Exchange, Oxford, UMR, Medicare Advantage, or Part D.
  2. Use your letter's number first. Fall back to the table only if you have no letter.
  3. Write a one-page cover sheet with the member's name, member ID, date of birth, the claim or reference number, what you are asking for, and the total page count.
  4. Attach the denial notice or EOB so the reviewer can see exactly which decision you are challenging.
  5. Add the evidence. For an appeal, that usually means a letter from the treating doctor and the relevant records.
  6. Mark urgent requests at the top and give the clinical reason. An urgent line is for cases where waiting for a standard review could seriously jeopardize the member's life, health, or ability to regain maximum function.
  7. Send everything in one transmission and keep the confirmation.

No fax machine is needed. You can send a fax online for $2.99 with no subscription and no account, and receive the delivery confirmation by email.

Why faxes to UnitedHealthcare get stuck

  • Wrong plan line. An Individual Exchange appeal faxed to a commercial line, or a UMR appeal sent to UnitedHealthcare's general units, arrives somewhere with no record of the case.
  • Faxing a medical prior authorization. Unless your plan has a state-required fax line, a faxed medical prior authorization will not be processed.
  • Urgent requests with no reason. "Urgent" without a clinical explanation is often handled as standard.
  • Missing identifiers. Each page needs the member ID and the claim or reference number. Pages get separated during scanning.
  • Split transmissions. An appeal sent across several faxes can be reviewed before the last part arrives.
  • Using a number from a third-party list. These go stale, and the pages carry protected health information.

For Original Medicare (not Medicare Advantage), appeals go to a Medicare contractor rather than to UnitedHealthcare; see how to fax Medicare. For a general overview of insurer fax lines, see faxing an insurance company.

Getting a fax to UnitedHealthcare right comes down to matching the plan type to the right line, using the number on your letter when you have one, and keeping the confirmation.

Fax your UnitedHealthcare documents now →

Frequently asked questions

What is the UnitedHealthcare appeals fax number?

It depends on the plan. The 2026 UnitedHealthcare provider administrative guide lists 1-866-654-6323 for urgent clinical appeals for commercial members, 1-888-404-0949 for standard Individual Exchange appeals, and 1-866-308-6294 is the Medicare Part D appeals fax on uhc.com. Standard commercial appeals go by mail or through the portal.

Can I fax a prior authorization to UnitedHealthcare?

For most medical services, no. UnitedHealthcare asks for medical prior authorizations through the provider portal, EDI 278, or API, and only keeps fax lines where state law requires them. Pharmacy requests are different: Optum Rx lists 800-527-0531 for non-specialty and 800-853-3844 for specialty medications.

What is the UnitedHealthcare Medicare Advantage appeal fax?

UnitedHealthcare tells Medicare Advantage members to fax appeals to the number in their Evidence of Coverage, because it varies by plan. The 2026 administrative guide lists 1-888-517-7113 for forwarding Medicare Advantage member appeals and grievances, but your EOC or denial letter is the better source.

How long do I have to appeal a UnitedHealthcare denial?

The deadline is printed on the denial notice and depends on the plan. For Medicare Part D, UnitedHealthcare allows 65 days from the date of the unfavourable coverage determination. Employer plans follow the timeline in the plan documents.

Do I need a fax machine to fax UnitedHealthcare?

No. An online fax service sends the same transmission over the phone network from a browser or phone, and gives you a delivery confirmation for your records.

Sources